I've got the glo,
I bought some books from kobo,
now i have calibre portable on a stick, so i can read any where without my reader and iphone
At my work it isn't possible to instal kobo desktop (security reasons)
But some times i have some time to spare
But the books from kobo aren't visible or readeble
It's not for illigal reason just to read at work
is this possible?

You need to download the ePub version of the books from the kobobooks website. This will get as version of the books that are protected by DRM. to loaf those into calibre do a Google search for "Apprentice Alf" and follow his directions.